The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 07, 1976
Filed:
Feb. 26, 1975
Applicant:
Inventors:
Joseph L Johnson, Houston, TX (US);
Shelby L Guidry, Conroe, TX (US);
Assignee:
Schlumberger Technology Corporation, New York, NY (US);
Primary Examiner:
Int. Cl.
CPC ...
E21B / ;
U.S. Cl.
CPC ...
1662 / ; 137510 ;
Abstract
In accordance with an illustrative embodiment of the present invention, a subsurface safety valve assembly that automatically closes in response to a drop in flowing pressure at the valve to a value that is below a set dome pressure, is provided with a flow restriction upstream of the valve that is sized to enable rapid closing of the safety valve in the event of disruption of surface flow lines or the like.